In this paper, a new g-C 3N 4/SrTa 2O 6 heterojunction photocatalyst was designed and prepared by chimie douce (soft chemistry) method where carbon nitride (g-C 3N 4) was deposited over the metastable perovskite phase of SrTa 2O 6. The morphological study of the heterojunction using SEM and STEM revealed that g-C 3N 4 nanofibers are dispersed uniformly on the surface of SrTa 2O 6 plates leading to the intimate contact between them. The heterojunction could achieve a high and stable visible light photocatalytic H 2 generation of 137 mmol/h/mole of g-C 3N 4, which is much larger than the amount of hydrogen generated by one mole of pristine g-C 3N 4. Finally, a plausible mechanism for the observed enhanced photocatalytic activity for the heterojunction is proposed on the basis of effective charge separation of photogenerated electron-hole pairs, supported by band position calculations and photo-physical properties of g-C 3N 4 and SrTa 2O 6.

@article{osti_1376489,
title = {Enhanced visible light photocatalytic water reduction from a g-C3N4/SrTa2O6 heterojunction},
author = {Adhikari, Shiba P. and Hood, Zachary D. and Wang, Hui and Peng, Rui and Krall, Alex and Li, Hui and Chen, Vincent W. and More, Karren L. and Wu, Zili and Geyer, Scott and Lachgar, Abdou},
abstractNote = {In this paper, a new g-C3N4/SrTa2O6 heterojunction photocatalyst was designed and prepared by chimie douce (soft chemistry) method where carbon nitride (g-C3N4) was deposited over the metastable perovskite phase of SrTa2O6. The morphological study of the heterojunction using SEM and STEM revealed that g-C3N4 nanofibers are dispersed uniformly on the surface of SrTa2O6 plates leading to the intimate contact between them. The heterojunction could achieve a high and stable visible light photocatalytic H2 generation of 137 mmol/h/mole of g-C3N4, which is much larger than the amount of hydrogen generated by one mole of pristine g-C3N4. Finally, a plausible mechanism for the observed enhanced photocatalytic activity for the heterojunction is proposed on the basis of effective charge separation of photogenerated electron-hole pairs, supported by band position calculations and photo-physical properties of g-C3N4 and SrTa2O6.},
doi = {10.1016/j.apcatb.2017.05.092},
journal = {Applied Catalysis. B, Environmental},
number = ,
volume = 217,
place = {United States},
year = {2017},
month = {6}
}

Direct Z-scheme NiTiO 3/g-C 3N 4 heterojunctions were successfully assembled by using simple calcination method and the photoelectrochemical and photocatalytic performance were investigated by light emitting diode (LED). The photoanode composed by the heterojunction with about 50 wt% NiTiO 3 content exhibits the best photoelectrochemical activity with photoconversion efficiency up to 0.066%, which is 4.4 and 3.13 times larger than NiTiO 3 or g-C 3N 4. Here, the remarkably enhanced photoelectrochemical and photocatalytic activity of the heterojunction can be due to the efficiently photogenerated electron-hole separation by a Z-scheme mechanism.

Highlights: • G-C{sub 3}N{sub 4}/Bi{sub 12}TiO{sub 20} heterojunction was fabricated by a hydrothermal-annealing method. • Heterojunction structure accelerates the separation of photo-generated carriers. • Match in energy band renders the heterojunction excellent photocatalytic activity. • Rhodamine B can be mostly degraded by the heterojunction in 5 h under visible light. - Abstract: In recent years, the high-efficient visible-light-driven photocatalyst has become a research focus to realize the large-scale application of semiconductor photocatalysis. Herein, a novel nanoplate-like g-C{sub 3}N{sub 4}/Bi{sub 12}TiO{sub 20} (CN/BTO) heterojunction was prepared by a facile hydrothermal-annealing method for visible-light photocatalysis, and its morphology, structure and optical propertymore » were characterized systematically. The characterization results verify that the C−O bond exists between g-C{sub 3}N{sub 4} and BTO, thus confirming the formation of CN−BTO heterojunction. Furthermore, the CN/BTO heterojunctions display much higher photocatalytic performance for Rhodamine B (RhB) degradation than pure BTO and g-C{sub 3}N{sub 4} under visible light irradiation. Among them, the CN/BTO-3 sample with 60 wt% of g-C{sub 3}N{sub 4} exhibits the highest photocatalytic activity. The excellent photocatalytic activity can be primarily attributed to the energy band match and the heterojunction that can accelerate the migration and separation of photo-generated charge carriers. This kind of nanoplate-like CN/BTO heterojunction may find potential applications in numerous fields related to environment and energy.« less

Here, different visible-light-active g-C 3N 4/nitrogen-doped Sr 2Nb 2O 7 heterojunction photocatalysts were fabricated by deposition of graphitic carbon nitride over N-doped strontium pyro-niobate prepared by ammonolysis at different temperatures of solvothermally synthesized Sr 2Nb 2O 7 nanorods. Their photocatalytic performance was determined by the amount of hydrogen generated from water reduction under visible light irradiation. The best performing heterojunction was found to be the one formed by g-C 3N 4 and N-doped Sr 2Nb 2O 7 obtained at 700°C. The enhanced activity of the heterojunction can be explained by better charge separation due to proper bands alignment and intimatemore » contact between the heterojunction components as revealed by electron microscopy. A mechanism for the observed enhanced photocatalytic activity is proposed and supported by band position calculations and photoluminescence data.« less

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